A new study shows warmer than normal ocean temperatures caused by global warming boosted maximum intensities for most storms between 2019 and 2023, as well as for every 2024 hurricane.

As a result of climate change, maximum wind speeds generated by 84 percent of Atlantic hurricanes between 2019 and 2023 intensified by an average of 18 miles per hour, according to a Climate Central study published in Environmental Research: Climate.

Thirty hurricanes studied reached intensities roughly one category higher on the Saffir-Simpson Hurricane Wind Scale compared to their expected strength in an environment without the influence of human-caused climate change, the research showed.

The study applied sea surface temperature attribution science to established methods for calculating their contribution to tropical cyclone intensity.

Of the storms studied, three strengthened into Category 5 hurricanes because of climate change: Lorenzo (2019), Ian (2022) and Lee (2023).

Applying the framework to the 2024 season adds two more Category 5 hurricanes that would have been unlikely without the influence of climate change: Beryl and Milton.

A companion report on the 2024 Atlantic Basin hurricane season released by Climate Central found that maximum wind speeds for all 11 hurricanes to date were increased by 9 to 28 miles per hour because of elevated sea surface temperatures caused by climate change.

“Every hurricane in 2024 was stronger than it would have been 100 years ago,” Dr. Daniel Gilford, climate scientist at Climate Central and lead author of the study and report, said. “Through record-breaking ocean warming, human carbon pollution is worsening hurricane catastrophes in our communities.”

Hurricane Milton rapidly intensified by 120 miles per hour in less than 36 hours over warm waters where temperatures were made 400-800 times more likely by climate change, according to a Climate Shift Index: Ocean analysis.

The record-setting temperatures, commonly more than three degrees Fahrenheit above normal, would be virtually impossible without the influence of carbon pollution, the report noted.

The study focused on storms in the Atlantic Basin, but the resulting rapid attribution framework can be used to study tropical cyclones worldwide.

“There is an urgent need to quantify and communicate the impact of climate change on hurricanes,” Dr. Ralf Toumi, co-director of the Grantham Institute – Climate Change and Environment, Imperial College London said. “In this outstanding paper, Gilford, Giguere, and Pershing present an impressive new framework. It uses the well understood and tested concept of maximum potential intensity of hurricanes and combines this with the climate change fingerprint on sea surface temperatures. This original and thorough work now offers us a route to rapid attribution of hurricane intensity to climate change.”